The only thing I'd do to that wall is maybe bump the secondary bounces down a tick to get richer dark areas. Just a personal preference, though. Either way its completely epic.
A poster, right now. Plus a (printed) portfolio. The former you can find in a small blog I started very recently for me specifically to post WIPs: ambiescent.com/blog
colossus72, I'm still liking your futuristic interiors a lot. :) But as for suggestions: I'd say, why not try more variations in the overall color tone. I like the neutral beige/browns, but I've seen it in a lot of your works -- maybe trying a different color cast can make this more unique.
I have plans for creating skins for Winamp and BSPlayer, too. The next Winamp skin I´m planning to make would be "Bólido" or "The Royal Legacy", two different projects.